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| Naji, M. |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Strano, Matteo
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Topics
Publications (11/11 displayed)
- 2023A Data-Based Tool Failure Prevention Approach in Progressive Die Stampingcitations
- 2021Effect of printing parameters on mechanical properties of extrusion-based additively manufactured ceramic partscitations
- 2021The effect of printing parameters on sintered properties of extrusion-based additively manufactured stainless steel 316L partscitations
- 2021Optimization of process-property relations of 3D printed ceramics using extrusion-based additive manufacturingcitations
- 2021Extrusion-based additive manufacturing of forming and molding toolscitations
- 2020Evolution of porosity and geometrical quality through the ceramic extrusion additive manufacturing process stagescitations
- 2019Processability of SS316L powder - binder mixtures for vertical extrusion and deposition on table testscitations
- 2019A comprehensive review of extrusion-based additive manufacturing processes for rapid production of metallic and ceramic partscitations
- 2018Rapid production of hollow SS316 profiles by extrusion based additive manufacturingcitations
- 2017Application of the Kalai-Smorodinsky approach in multi-objective optimization of metal forming processescitations
- 2016Feasibility Study of an Extrusion-based Direct Metal Additive Manufacturing Techniquecitations
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article
Evolution of porosity and geometrical quality through the ceramic extrusion additive manufacturing process stages
Abstract
<p>Ceramic Extrusion Additive Manufacturing (CEAM) enables the die-less fabrication of small ceramic parts, with a process chain that includes four consecutive stages: the 3D printing, solvent de-binding, thermal de-binding, and sintering. The 3D printing process was implemented through Ephestus, a specially developed EAM machine for the manufacturing of parts from alumina feedstock. A test part was designed, and X-ray computed tomography (μ-CT) was used to quantify its characteristics through the processing stages of the EAM. The porosity distribution and the distribution of void size and shape were determined throughout the samples at each stage, using image analysis techniques. Furthermore, the evolution of some macroscopic quality properties was measured. The results show that both microscopic (porosity) and macroscopic (geometry, density) properties of the samples improve through the process stages. A vertical gradient of porosity is present in green and de-bound samples, with porosity decreasing with increasing sample height. After sintering, the vertical gradient of porosity disappears. The sphericity and the diameter of voids are negatively correlated and dispersed over a wide range in the green state. The sintering process has a homogenization effect on the void shape distribution. The geometrical deviation from the nominal designed dimensions and the surface quality of parts improves when moving from the green to the sintered state.</p>